Don't make chrome.exe depend on the metro_driver unittests.

Just noticed this, this should speed up builds a tiny bit.

BUG=NONE
TEST=NONE

Review URL: https://codereview.chromium.org/83573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236978 0039d316-1c4b-4281-b951-d872f2087c98

chrome/chrome_exe.gypi

@@ -540,7 +540,7 @@
         }],
         ['OS=="win"', {
           'dependencies': [
-            '../win8/metro_driver/metro_driver.gyp:*',
+            '../win8/metro_driver/metro_driver.gyp:metro_driver',
             '../win8/delegate_execute/delegate_execute.gyp:*',
           ],
         }],